science
Grade-11
Easy

Question

Which disease or disorder is the result of having an extra chromosome?

  1. Cystic Fibrosis
  2. Hemophilia  
  3. Colorblindness
  4. Down Syndrome

Hint:

The disorder causes trisomy of chromosome 21.

The correct answer is: Down Syndrome


    Down syndrome or chromosome 21 trisomy is a type of chromosomal genetic disorder. Chromosomal genetic disorder refers to change in the structure of a chromosome due to addition or deletion of chromosomal segments during cell division.
    In Down syndrome, the chromosome 21 will have an additional chromosome due to improper division during meiosis. The individual will posses problems in the nervous system and lack intellectual skills.

    • Down syndrome is also termed as trisomy 21
    • Individuals posses an extra chromosome at 21 position
    • Trisomy 21 is caused due to improper separation of chromosomes during meiosis
    • Cystic fibrosis is an autosomal recessive disorder
    • Color blindness is an autosomal dominant disorder
    • Hemophilia is a monogenic genetic disorder

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